package com.sky.service.impl;

import com.alibaba.fastjson.JSON;
import com.alibaba.fastjson.JSONObject;
import com.github.pagehelper.Page;
import com.github.pagehelper.PageHelper;
import com.sky.constant.MessageConstant;
import com.sky.context.BaseContext;
import com.sky.dto.*;
import com.sky.entity.*;
import com.sky.exception.AddressBookBusinessException;
import com.sky.exception.OrderBusinessException;
import com.sky.exception.ShoppingCartBusinessException;
import com.sky.mapper.*;
import com.sky.result.PageResult;
import com.sky.service.OrderService;
import com.sky.utils.WeChatPayUtil;
import com.sky.vo.OrderPaymentVO;
import com.sky.vo.OrderStatisticsVO;
import com.sky.vo.OrderSubmitVO;
import com.sky.vo.OrderVO;
import com.sky.websocket.WebSocketServer;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.core.annotation.Order;
import org.springframework.stereotype.Service;
import org.springframework.transaction.annotation.Transactional;
import org.springframework.util.CollectionUtils;

import java.math.BigDecimal;
import java.time.LocalDateTime;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.stream.Collectors;

@Service
public class OrderServiceImpl implements OrderService {

    @Autowired
    private OrderMapper orderMapper;
    @Autowired
    private OrderDetailMapper orderDetailMapper;
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private UserMapper userMapper;
    @Autowired
    private AddressBookMapper addressBookMapper;
    @Autowired
    private WeChatPayUtil weChatPayUtil;
    @Autowired
    private WebSocketServer webSocketServer;
    /**
     * 用户下单
     *
     * @param ordersSubmitDTO
     * @return
     */
    @Override
    public OrderSubmitVO submit(OrdersSubmitDTO ordersSubmitDTO) {
        Long userId = BaseContext.getCurrentId();
        // 处理业务异常 1.购物车是否为空？ 2.地址是否为空？
        ShoppingCart shoppingCart = new ShoppingCart();
        shoppingCart.setUserId(userId);
        List<ShoppingCart> shoppingCartList = shoppingCartMapper.list(shoppingCart);
        if (shoppingCartList == null && shoppingCartList.size() == 0) {
            throw new ShoppingCartBusinessException(MessageConstant.SHOPPING_CART_IS_NULL);
        }

        Long addressBookId = ordersSubmitDTO.getAddressBookId();
        AddressBook addressBook = addressBookMapper.getById(addressBookId);
        if (addressBook == null) {
            throw new AddressBookBusinessException(MessageConstant.ADDRESS_BOOK_IS_NULL);
        }
        // 向订单表插入一条数据
        Orders orders = new Orders();
        BeanUtils.copyProperties(ordersSubmitDTO, orders);
        orders.setOrderTime(LocalDateTime.now());
        orders.setPayStatus(Orders.UN_PAID);
        orders.setStatus(Orders.PENDING_PAYMENT);
        orders.setNumber(String.valueOf(System.currentTimeMillis()));
        orders.setAddress(addressBook.getDetail());
        orders.setPhone(addressBook.getPhone());
        orders.setConsignee(addressBook.getConsignee());
        orders.setUserId(userId);

        orderMapper.insert(orders);
        // 向订单明细表插入n条数据
        List<OrderDetail> orderDetailList = new ArrayList<>();

        for (ShoppingCart cart : shoppingCartList) {
            OrderDetail orderDetail = new OrderDetail();
            BeanUtils.copyProperties(cart, orderDetail);
            orderDetail.setOrderId(orders.getId());
            orderDetailList.add(orderDetail);
        }

        orderDetailMapper.insertBatch(orderDetailList);

        // 清空购物车数据
        shoppingCartMapper.deleteByUserId(userId);

        // 封装VO返回结果
        OrderSubmitVO submitVO = OrderSubmitVO.builder()
                .id(orders.getId())
                .orderAmount(ordersSubmitDTO.getAmount())
                .orderNumber(orders.getNumber())
                .orderTime(orders.getOrderTime())
                .build();

        return submitVO;
    }

    /**
     * 订单支付
     *
     * @param ordersPaymentDTO
     * @return
     */
    public OrderPaymentVO payment(OrdersPaymentDTO ordersPaymentDTO) throws Exception {
        // 当前登录用户id
        Long userId = BaseContext.getCurrentId();
        User user = userMapper.getById(userId);

        //调用微信支付接口，生成预支付交易单
        JSONObject jsonObject = weChatPayUtil.pay(
                ordersPaymentDTO.getOrderNumber(), //商户订单号
                new BigDecimal(0.01), //支付金额，单位 元
                "苍穹外卖订单", //商品描述
                user.getOpenid() //微信用户的openid
        );

        if (jsonObject.getString("code") != null && jsonObject.getString("code").equals("ORDERPAID")) {
            throw new OrderBusinessException("该订单已支付");
        }

        OrderPaymentVO vo = jsonObject.toJavaObject(OrderPaymentVO.class);
        vo.setPackageStr(jsonObject.getString("package"));

        return vo;
    }

    /**
     * 支付成功，修改订单状态
     *
     * @param outTradeNo
     */
    public void paySuccess(String outTradeNo) {

        // 根据订单号查询订单
        Orders ordersDB = orderMapper.getByNumber(outTradeNo);

        // 根据订单id更新订单的状态、支付方式、支付状态、结账时间
        Orders orders = Orders.builder()
                .id(ordersDB.getId())
                .status(Orders.TO_BE_CONFIRMED)
                .payStatus(Orders.PAID)
                .checkoutTime(LocalDateTime.now())
                .build();

        orderMapper.update(orders);

        // 通过websocket发送消息
        Map map = new HashMap();
        // 1表示来电提醒 ，2表示客户催单
        map.put("type",1);
        map.put("orderId",ordersDB.getId());
        map.put("content","订单号" + outTradeNo);

        String json = JSON.toJSONString(map);
        webSocketServer.sendToAllClient(json);
    }

    @Override
    public PageResult pageQueryForUser(int pageNum, int pageSize, Integer status) {
        PageHelper.startPage(pageNum, pageSize);

        OrdersPageQueryDTO ordersPageQueryDTO = new OrdersPageQueryDTO();
        ordersPageQueryDTO.setUserId(BaseContext.getCurrentId());
        ordersPageQueryDTO.setStatus(status);

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> list = new ArrayList<>();

        if (page != null && page.getTotal() > 0) {
            for (Orders orders : page) {
                Long orderId = orders.getId();

                List<OrderDetail> orderDetails = orderDetailMapper.getByOrderId(orderId);


                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orderVO, orders);
                orderVO.setOrderDetailList(orderDetails);

                list.add(orderVO);
            }
        }

        return new PageResult(page.getTotal(), list);
    }

    /**
     * 查询订单详情
     *
     * @param id
     * @return
     */
    @Override
    public OrderVO details(Long id) {
        Orders orders = orderMapper.getById(id);

        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        OrderVO orderVO = new OrderVO();
        BeanUtils.copyProperties(orderVO, orders);
        orderVO.setOrderDetailList(orderDetailList);
        return orderVO;
    }

    /**
     * 用户取消订单
     *
     * @param id
     */
    @Override
    public void userCancelById(Long id) throws Exception {
        Orders ordersDB = orderMapper.getById(id);

        // 判断订单是否存在？
        if (ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }
        // 判断订单是否已被送出？
        if (ordersDB.getStatus() > 2) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());

        // 订单处于待接单状态下取消，需要进行退款
        if (ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            //调用微信支付退款接口
            weChatPayUtil.refund(
                    ordersDB.getNumber(), //商户订单号
                    ordersDB.getNumber(), //商户退款单号
                    new BigDecimal(0.01),//退款金额，单位 元
                    new BigDecimal(0.01));//原订单金额

            //支付状态修改为 退款
            orders.setPayStatus(Orders.REFUND);
        }

        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason("用户取消订单");
        orders.setCancelTime(LocalDateTime.now());
        orderMapper.update(orders);
    }

    /**
     * 再来一单
     *
     * @param id
     */
    @Override
    public void repetition(Long id) {
        // 通过ID查询订单信息
        Orders orderDB = orderMapper.getById(id);
        // 根据订单ID查询订单详情
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orderDB.getId());

        // 将订单详情转换为购物车列表
        List<ShoppingCart> shoppingCartList = orderDetailList.stream().map(orderDetail -> {
            ShoppingCart shoppingCart = new ShoppingCart();

            // ignoreProperties是用来排除id属性不做复制
            BeanUtils.copyProperties(orderDetail, shoppingCart, "id");
            // 设置用户ID
            shoppingCart.setUserId(orderDB.getUserId());
            // 设置创建时间
            shoppingCart.setCreateTime(LocalDateTime.now());

            return shoppingCart;
        }).collect(Collectors.toList());

        // 批量插入购物车列表
        shoppingCartMapper.insertBatch(shoppingCartList);

    }

    /**
     * 订单搜索
     * @param ordersPageQueryDTO
     * @return
     */
    @Override
    public PageResult conditionSearch(OrdersPageQueryDTO ordersPageQueryDTO) {
        PageHelper.startPage(ordersPageQueryDTO.getPage(),ordersPageQueryDTO.getPageSize());

        Page<Orders> page = orderMapper.pageQuery(ordersPageQueryDTO);

        List<OrderVO> orderVOList = getOrderVOList(page);

        return new PageResult(page.getTotal(), orderVOList);
    }

    /**
     * 获取订单VO集合
     * @param page
     * @return
     */
    private List<OrderVO> getOrderVOList(Page<Orders> page) {
        // 需要返回订单菜品信息，自定义OrderVO响应结果
        List<OrderVO> orderVOList = new ArrayList<>();

        List<Orders> ordersList = page.getResult();
        if (!CollectionUtils.isEmpty(ordersList)) {
            for (Orders orders : ordersList) {
                // 将共同字段复制到OrderVO
                OrderVO orderVO = new OrderVO();
                BeanUtils.copyProperties(orders, orderVO);
                String orderDishes = getOrderDishesStr(orders);

                // 将订单菜品信息封装到orderVO中，并添加到orderVOList
                orderVO.setOrderDishes(orderDishes);
                orderVOList.add(orderVO);
            }
        }
        return orderVOList;
    }

    /**
     * 根据订单id获取菜品信息字符串
     * @param orders
     * @return
     */
    private String getOrderDishesStr(Orders orders) {
        // 查询订单菜品详情信息（订单中的菜品和数量）
        List<OrderDetail> orderDetailList = orderDetailMapper.getByOrderId(orders.getId());

        // 将每一条订单菜品信息拼接为字符串（格式：宫保鸡丁*3；）
        List<String> orderDishList = orderDetailList.stream().map(x -> {
            String orderDish = x.getName() + "*" + x.getNumber() + ";";
            return orderDish;
        }).collect(Collectors.toList());

        // 将该订单对应的所有菜品信息拼接在一起
        return String.join("", orderDishList);
    }

    /**
     * 各个状态的订单数量统计
     * @return
     */
    @Override
    public OrderStatisticsVO statistics() {
        Integer toBeConfirmed = orderMapper.countStatus(Orders.TO_BE_CONFIRMED);
        Integer confirmed = orderMapper.countStatus(Orders.CONFIRMED);
        Integer deliveryInProgress = orderMapper.countStatus(Orders.DELIVERY_IN_PROGRESS);

        OrderStatisticsVO orderStatisticsVO = new OrderStatisticsVO();
        orderStatisticsVO.setConfirmed(confirmed);
        orderStatisticsVO.setToBeConfirmed(toBeConfirmed);
        orderStatisticsVO.setDeliveryInProgress(deliveryInProgress);

        return orderStatisticsVO;
    }

    /**
     * 接单
     * @param ordersConfirmDTO
     */
    @Override
    public void confirm(OrdersConfirmDTO ordersConfirmDTO) {

        Orders orders = Orders.builder()
                .id(ordersConfirmDTO.getId())
                .status(Orders.CONFIRMED)
                .build();
        orderMapper.update(orders);
    }

    /**
     * 拒单
     * @param ordersRejectionDTO
     * @throws Exception
     */
    @Override
    public void rejection(OrdersRejectionDTO ordersRejectionDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersRejectionDTO.getId());

        if (ordersDB == null && !ordersDB.getStatus().equals(Orders.TO_BE_CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == Orders.PAID) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));

        }

        // 拒单需要退款，根据订单id更新订单状态、拒单原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setRejectionReason(ordersRejectionDTO.getRejectionReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 取消订单
     * @param ordersCancelDTO
     * @throws Exception
     */
    @Override
    public void cancel(OrdersCancelDTO ordersCancelDTO) throws Exception {
        // 根据id查询订单
        Orders ordersDB = orderMapper.getById(ordersCancelDTO.getId());

        //支付状态
        Integer payStatus = ordersDB.getPayStatus();
        if (payStatus == 1) {
            //用户已支付，需要退款
            String refund = weChatPayUtil.refund(
                    ordersDB.getNumber(),
                    ordersDB.getNumber(),
                    new BigDecimal(0.01),
                    new BigDecimal(0.01));

        }

        // 管理端取消订单需要退款，根据订单id更新订单状态、取消原因、取消时间
        Orders orders = new Orders();
        orders.setId(ordersCancelDTO.getId());
        orders.setStatus(Orders.CANCELLED);
        orders.setCancelReason(ordersCancelDTO.getCancelReason());
        orders.setCancelTime(LocalDateTime.now());

        orderMapper.update(orders);
    }

    /**
     * 派送订单
     * @param id
     */
    @Override
    public void delivery(Long id) {
        Orders ordersDB = orderMapper.getById(id);

        if(ordersDB == null && !ordersDB.getStatus().equals(Orders.CONFIRMED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        Orders orders = new Orders();
        orders.setId(ordersDB.getId());
        orders.setStatus(Orders.DELIVERY_IN_PROGRESS);

        orderMapper.update(orders);
    }

    /**
     * 完成订单
     * @param id
     */
    @Override
    public void complete(Long id) {
        // 通过ID查询订单详细信息
        Orders ordersDB = orderMapper.getById(id);

        // 判断订单是否存在，并且状态是否为已完成，如果满足条件，则抛出订单状态错误的异常
        if(ordersDB == null && ordersDB.getStatus().equals(Orders.COMPLETED)) {
            throw new OrderBusinessException(MessageConstant.ORDER_STATUS_ERROR);
        }

        // 创建一个新的订单对象，用于更新订单状态
        Orders orders = new Orders();
        // 设置订单ID，与查询到的订单ID相同
        orders.setId(ordersDB.getId());
        // 设置订单状态为已完成
        orders.setStatus(Orders.COMPLETED);
        // 设置订单的配送时间为当前时间
        orders.setDeliveryTime(LocalDateTime.now());

        // 更新订单信息
        orderMapper.update(orders);
    }

    /**
     * 催单
     * @param id
     */
    @Override
    public void reminder(Long id) {
        Orders ordersDB = orderMapper.getById(id);

        if(ordersDB == null) {
            throw new OrderBusinessException(MessageConstant.ORDER_NOT_FOUND);
        }

        Map map = new HashMap();
        map.put("type",2);
        map.put("orderId",id);
        map.put("content","订单号"+ ordersDB.getNumber());

        String json = JSON.toJSONString(map);

        webSocketServer.sendToAllClient(json);
    }
}
